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Brown, Peter G., with J. D. Assink, L. Astiz, R. Blaauw, M. B. Boslough, J. Borovička, N. Brachet, D. Brown, M. Campbell-Brown, L. Ceranna, W. Cooke, C. de Groot-Hedlin, D. P. Drob, W. Edwards, L. G. Evers, M. Garces, J. Gill, M. Hedlin, A. Kingery, G. Laske, A. Le Pichon, P. Mialle, D. E. Moser, A. Saffer, E. Silber, P. Smets, R. E. Spalding, P. Spurný, E. Tagliaferri, D. Uren, R. J. Weryk, R. Whitaker & Z. Krzeminski. "A 500-Kiloton Airburst Over Chelyabinsk and An Enhanced Hazard from Small Impactors" Archived December 4, 2021, at the Wayback Machine, Nature, Volume 503, pages 238–241, November 14, 2013, and published online November 6, 2013, doi:10.1038/nature12741 (subscription required).
Lu, Edward T.; Love, Stanley G. Gravitational Tractor For Towing Asteroids Archived March 26, 2017, at the Wayback Machine, Nature, Volume 438, pages 177–178, November 10, 2005, doi:10.1038/438177a. Also, see astro-ph/0509595 Archived June 3, 2016, at the Wayback Machine in the arXiv.
Watson, Traci (June 19, 2015). "Private asteroid hunt lacks cash to spy threats in orbit". Nature. Archived from the original on November 25, 2020. Retrieved June 20, 2015. Yet progress has been slow. The B612 Foundation raised donations of roughly $1.2 million in 2012 and $1.6 million in 2013 — far short of its annual goal of $30 million to $40 million. NASA says that Sentinel has also missed every development milestone laid out in the 2012 agreement.

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Watson, Traci (June 19, 2015). "Private asteroid hunt lacks cash to spy threats in orbit". Nature. Archived from the original on November 25, 2020. Retrieved June 20, 2015. Yet progress has been slow. The B612 Foundation raised donations of roughly $1.2 million in 2012 and $1.6 million in 2013 — far short of its annual goal of $30 million to $40 million. NASA says that Sentinel has also missed every development milestone laid out in the 2012 agreement.
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wired.com (Global: 254^th place; English: 178^th place)

Lufkini, Bryan. The Asteroid Stalker Archived July 14, 2014, at the Wayback Machine (summarized web article version), Wired, April 2014, page 37; and This Ex-Astronaut Is Stalking Asteroids to Save Civilization Archived December 22, 2016, at the Wayback Machine, Wired, April 2014, page 38. Retrieved June 30, 2014, and July 8, 2014, respectively.
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B612 Foundation (English Wikipedia)

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